Full synthetic for us too on our '18. Metal bolt, not plastic. I don't need to jack up the front to slide under as long as I lay on the floor and not a dolly, and I'm a big person. Nice tip on rotating the oil pan cover, I'll have to try that next time. I'm usually able to find 5 qts synthetic at our local auto parts store (O'Reillys, Western Washington area) for no more than $25, and sometimes they run a special that includes the oil filter in that price. Oil changes are easier on our Navigator than most vehicles, easy access to everything.